I travel on trail that's shimmering (10)
I believe the answer is:
iridescent
'shimmering' is the definition.
Both the definition and answer are adjectives. Maybe there's an association between them I don't understand?
'i travel on trail' is the wordplay.
'travel on' becomes 'ride' (I've seen this before).
'trail' becomes 'scent' (an animal's trail is its scent).
'i'+'ride'+'scent'='IRIDESCENT'
'that's' is the link.
Can you help me to learn more?
(Other definitions for iridescent that I've seen before include "Glittering with changing colours" , "with a glittering display" , "Sparkling" , "flashing colours" , "Shimmering with rainbow colours (anag of 1 across, 9 and 23)" .)